Show simple item record

dc.rights.licenseIn Copyrighten_US
dc.creatorGilfillan, Taylor Wade
dc.date.accessioned2013-04-29T13:42:40Z
dc.date.available2013-04-29T13:42:40Z
dc.date.created2013
dc.date.issued2013
dc.identifier.urihttp://hdl.handle.net/11021/23857
dc.descriptionThesis; [FULL-TEXT FREELY AVAILABLE ONLINE]en_US
dc.descriptionTaylor Wade Gilfillan is a member of the Class of 2013 of Washington and Lee University.en_US
dc.description.abstractI experimentally study the dynamics of vertical-cavity surface-emitting lasers (VCSELs) with polarization-rotated optical feedback. This type of semiconductor laser naturally emits linearly-polarized light and can elicit complex laser dynamics when subjected to optical feedback. Polarization-rotated optical feedback is created by a mirror placed a distance away from the laser (forming an external cavity) and the rotation of the feedback’s polarization by 90° while in the cavity before being reinjected into the laser.  Among the various complex dynamics that can possibly result from this form of feedback include chaotic behavior, polarization mono- and bistability, and square-waves. My experimental studies focus on the regularity of these square-waves. Noisy, square-wave-like polarization switchings are observed with periodicity slightly longer than twice the cavity round-trip delay time. I perform a separate parameter space study that indicates optimum operating conditions exist in feedback strength and pump current, for which the square waves are most regular.  This conclusion is supported by careful examination of time series data, as well as statistical studies of the mean switching period. Following my experimental results, I present the mathematical model used to numerically simulate a VCSEL known as the spin-flip model. This model specifically accounts for the rotated feedback present in our system and provides numerical results that further support our conclusion for square-wave optimization via mapping parameter space for pump current and birefringence of the semiconductor material.en_US
dc.description.statementofresponsibilityTaylor Wade Gilfillan
dc.language.isoen_USen_US
dc.rightsThis material is made available for use in research, teaching, and private study, pursuant to U.S. Copyright law. The user assumes full responsibility for any use of the materials, including but not limited to, infringement of copyright and publication rights of reproduced materials. Any materials used should be fully credited with the source.en_US
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en_US
dc.subject.lcshLasers in physicsen_US
dc.subject.lcshReliability (Engineering) -- Researchen_US
dc.subject.lcshSquare waves -- Researchen_US
dc.subject.lcshStructural failures -- Prevention -- Researchen_US
dc.subject.lcshMechanics, Applieden_US
dc.subject.otherWashington and Lee University -- Honors in Physicsen_US
dc.titleSquare Wave Optimization in Vertical-Cavity Surface-Emitting Lasers Subjected to Polarization-Rotated Optical Feedback (thesis)en_US
dc.typeTexten_US
dc.rights.holderGilfillan, Taylor Wade


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record